Recap Clamp 1008 and Production RIKEN/RBRC Itaru Nakagawa 1

More Clamps Installed in IR 2 Installed upto 28 clamps to North St.3 and monitored drawing currents for a week. Installed upto 28 clamps to North St.3 and monitored drawing currents for a week. Basically clamps didn’t add much drawing current up to humidity of 60+  %.

Input AC pulse from Cathode Action Items from Review (I) 1.AC readout 3 Reported in the June DC meeting In order to see clear difference between connected/unconnected channels, the connection between clamp and GND needs to be modified. Test bench using St-1 test chamber. Clamp channel in contact w/ pad Clamp channel not in contact w/ pad

AC Readout 4 HV side GND side HV side GND side DC Voltage Readout AC Voltage ReadoutOne AC readout clamp will be available for test on June 15 th.

AC Readout Input AC Readout AC (connected) Readout AC (not connected) Input AC Difference is 1/3 but it is kind of touchy Difference is 1/3 but it is kind of touchy

Plan for AC readout We need to sit down and thoroughly repeat the AC readout test bench. Pin down why we pickup AC signal even in non-connected channels. We’ll test AC readout again in 1008 in August. Move on to Production with AC readout design. 6

Action Items from Review II 1 Week Humidity test 7

Action Items from Review III Capacitors 8 3kV Rated Capacitors being used for ~ 1.9kV Operation. Should be verified reliability. 3kV Rated Capacitors being used for ~ 1.9kV Operation. Should be verified reliability. DEBB33F101K (Prototype) DEBB33F101K (Prototype) DEHR33F151K (Production) DEHR33F151K (Production) DEA1X3F101J 100pF 150pF Generating Heat Size of Capacitor Last longer (reliable) DEB DEH DEA Space constraint prevent from employing DEA model. -> DEH

Production Status Print Board Assembly $40k ~ $90k Procurement Base and Spacer ~ $10k Tokyo Precision Co. (Itabashi) Delivery to RIKEN in Oct.31 Dry Air Cover ~$16k AB Model Co. (Kawasaki) Delivery to BNL in Sept.31 Assembly of base and print board will be done by Students RIKEN. 9

Recap Assembly CompanyLocationMeetingContactQualification REPIC Co, OK Cnex Co.Tokyo6/27TakahashiD Soushin Co.Tokyo6/29SatoD Arusu Co.Fukushima6/29SatoC Pulax Co.Tokyo7/4OkamotoC Raising Co.Osaka 関 10 Trying to get quotes from several companies. Expecting bidding from a couple of companies above. Three companies are qualified to bid (Rank >= C).

Print Board Assembly Production Schedule Procurement : 7/13 ~ 7/29 Judge & Order : ~ 8/7 Production (560 clamps) : – Getting Materials (1 ~ 1.5 Month) – Assembly (1 ~ 2 Months) – Delivery to RIKEN (Oct.14) (Parylene?) Coating (1~ 2 weeks, End of Oct.) Assembly and (2weeks) Shipping to BNL (1week, Mid~End of November) 11